In 1943, Anne Truitt graduated from Bryn Mawr College with a degree in psychology, and for two years after that worked in a psychiatric ward at Massachusetts General Hospital. When Truitt started painting and sculpting in 1949, she wasn’t pivoting away from psychology but rather investigating thought through a new medium. Her work was monochrome, delicate layers of a single color built up on textured, geometric wood. “What is important to me is not geometrical shape per se, or color per se,” she wrote in 1965, “but to make a relationship between shape and color which feels to me like my experience.” At its West Hollywood outpost, Matthew Marks Gallery displays 10 white paintings from Truitt’s “Arundel” series, which she worked on between 1973 and 1999. “In these paintings I set forth, to see for myself how they appear, what might be called the tips of my conceptual icebergs,” Truitt explained. Each rectangular canvas is stark white, with occasional graphite lines and pops of titanium white. —Jensen Davis